Determination of Network Environment

1. A method for determining Universal Terrestrial Radio Access (UTRA) environment for a wireless terminal (WT) that supports operating in both a UTRA frequency-division duplexing (UTRA-FDD) environment and a UTRA time-division duplexing (UTRA-TDD) environment, the method being performed by the WT and comprising the steps of: acquiring a need for determining a UTRA environment of the WT, wherein said WT is camping on or served by a network node in a first cell; attempting to acquire an identity of a public land mobile network (PLMN) serving the WT, wherein said identity of said PLMN is associated with one of UTRA-FDD and UTRA-TDD; if said identity of a PLMN is not acquired, then acquiring a cell identity for at least one second cell, the at least one second cell neighbouring said first cell, wherein each respective cell identity is associated with one of UTRA-FDD and UTRA-TDD; and determining said UTRA environment of the WT based on network information received by the WT, said network information indicating if the WT is in the UTRA-FDD environment or in the UTRA-TDD environment, and based also on at least one of said acquired cell identity and said acquired identity of said PLMN.

2. The method according to claim 1 , wherein said network information is broadcasted network information.

3. The method according to claim 1 , wherein said network information comprises a unicast measurement configuration.

4. The method according to claim 1 , wherein said step of acquiring a cell identity only is performed if either said network information lacks unicast measurement configuration, or if said network information indicates neighbouring cells associated with UTRA-TDD and UTRA-FDD.

5. The method according to claim 1 , further comprising: acquiring a configuration parameter; and determining said UTRA environment based also on said acquired configuration parameter.

6. The method according to claim 5 , wherein said step of acquiring a configuration parameter only is performed if either at least one cell identity associated with UTRA-FDD and at least one cell identity associated with UTRA-TDD are acquired and if said identity of a PLMN is not acquired, or if neither a cell identity associated with UTRA-FDD nor a cell identity associated with UTRA-TDD are acquired and if said identity of a PLMN is not acquired.

7. The method according to claim 5 , wherein said configuration parameter is assigned a random value.

8. The method according to claim 5 , further comprising: acquiring said configuration parameter from user interaction.

9. The method according to claim 1 , further comprising: selecting an abstract syntax notation one, ASN. 1 , version corresponding to said determined UTRA environment.

10. The method according to claim 1 further comprising: receiving an indication that the WT is served by a cell with a new PLMN identity; and performing said step of acquiring a need for determining a UTRA environment of the WT in response thereto.

11. The method according to claim 1 , wherein the WT is served by a first radio access technology using an air interface different from UTRA, the method further comprising: receiving handover instructions from a network node serving the WT; and performing said step of acquiring a need for determining a UTRA environment of the WT in response thereto.

12. The method according to claim 1 , wherein the WT is served by a first radio access technology using an air interface different from UTRA, the method further comprising: receiving a request from a network node serving the WT to send a WT capability to the network node; and performing said step of acquiring a need for determining a UTRA environment of the WT in response thereto.

13. A wireless terminal, WT, for determining Universal Terrestrial Radio Access, UTRA, environment for the WT, the WT being configured for supporting operation in both a UTRA frequency -division duplexing, UTRA-FDD, environment and a UTRA time-division duplexing, UTRA-TDD, environment, the WT comprising a processing unit and a memory, said memory comprising instructions executable by said processing unit whereby said WT is operative to: acquire a need for determining a UTRA environment of the WT, wherein said WT is camping on or served by a network node in a first cell; attempt to acquire an identity of a public land mobile network (PLMN) serving the WT, wherein said identity of said PLMN is associated with one of UTRA-FDD and UTRA-TDD; if said identity of a PLMN is not acquired, then acquire a cell identity for at least one second cell, the at least one second cell neighbouring said first cell, wherein each respective cell identity is associated with one of UTRA-FDD and UTRA-TDD; and determine said UTRA environment of the WT based on network information received by the WT, said network information indicating if the WT is in the UTRA-FDD environment or in the UTRA-TDD environment, and based also on at least one of said acquired cell identity and said acquired identity of said PLMN.

14. A nontransitory computer readable storage medium comprising a computer program for determining Universal Terrestrial Radio Access (UTRA) environment for a wireless terminal (WT) that supports operating in both a UTRA frequency-division duplexing (UTRA-FDD) environment and a UTRA time-division duplexing (UTRA-TDD) environment, the computer program comprising computer program code which, when run on the WT, causes the WT to: acquire a need for determining a UTRA environment of the WT, wherein said WT is camping on or served by a network node in a first cell; attempt to acquire an identity of a public land mobile network (PLMN) serving the WT, wherein said identity of said PLMN is associated with one of UTRA-FDD and UTRA-TDD; if said identity of a PLMN is not acquired, then acquire a cell identity for at least one second cell, the at least one second cell neighbouring said first cell, wherein each respective cell identity is associated with one of UTRA-FDD and UTRA-TDD; and determine said UTRA environment of the WT based on network information received by the WT, said network information indicating if the WT is in the UTRA-FDD environment or in the UTRA-TDD environment, and based also on at least one of said acquired cell identity and said acquired identity of said PLMN.